Solution
Last year
2 units + 1 --> p
2 units --> p - 1
1 unit --> (p -1)/2
Two years from now
--> (p - 1)/2 + 3
= (p - 1)/2 + 6/2
= (p -5)/2
Answer: [(p - 5)/2] years old
Thursday, August 19, 2010
RGS Primary 2009 PSLE Math Prelim Paper 2 Q7
Last year the total age of Mr Tan and his wife was p years old. His wife is 1 year younger than him. What is his wife's age 2 years from now? Express your answer in terms of p.
Solution
Last year
2 units + 1 --> p
2 units --> p - 1
1 unit --> (p -1)/2
Two years from now
--> (p - 1)/2 + 3
= (p - 1)/2 + 6/2
= (p -5)/2
Answer: [(p - 5)/2] years old
Solution
Last year
2 units + 1 --> p
2 units --> p - 1
1 unit --> (p -1)/2
Two years from now
--> (p - 1)/2 + 3
= (p - 1)/2 + 6/2
= (p -5)/2
Answer: [(p - 5)/2] years old
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